VESA DDC/CI display backlight

[Alexander GamePad]

Well, this is a feature that is presents in most displays, but is  hardly
ever used by software.

Xorg could handle backlight of notebook displays, but not of standalone
displays.

There is a project called ddccontrol: http://ddccontrol.sourceforge.net/
The core of this project is not really tough to implement inside Mir,
because it is just a simple wrapper of I2C protocol.

Practical usage:
- Unified backlight interface (ACPI from notebooks, DDC/CI, maybe, HDMI)
- Ability to control display backlight from System Settings, xbacklight
(well, mirbacklight, of course ;) ) and from any other display tool.
- Ability to create such a cool feature as automatic backlight (using a
webcam).

So, is there a possibility to include DDC support in Mir?
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